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Related Experiment Videos

Extracellular cysteines define ectopeptidase (APN, CD13) expression and function.

Beate Firla1, Marco Arndt, Karin Frank

  • 1Institute of Immunology, Otto-von-Guericke-University of Magdeburg, Magdeburg, Germany. beate.firla@medizin.uni-magdeburg.de

Free Radical Biology & Medicine
|March 23, 2002
PubMed
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Alanyl aminopeptidase (APN) activity is modulated by cell surface thiol status. Extracellular cysteines are crucial for APN surface expression and function, impacting immune responses and cellular growth.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Enzymology

Background:

  • Alanyl aminopeptidase (APN) is a cell surface metallopeptidase involved in critical physiological processes.
  • APN regulates immune response, cellular growth, and blood pressure.
  • Leukocyte function is significantly impacted by APN gene expression and activity.

Purpose of the Study:

  • To investigate the role of cell surface thiol status in modulating APN enzymatic activity.
  • To determine the contribution of extracellular cysteines to APN surface expression and function.

Main Methods:

  • Investigated oxidoreductase-mediated effects on cell surface thiol status.
  • Generated and analyzed cysteine substitution mutants of APN.
  • Utilized high-resolution imaging and Endoglycosidase H digestion to assess protein localization and processing.

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Main Results:

  • Oxidoreductase-mediated changes in thiol status directly affect APN enzymatic activity.
  • Substitution of extracellular cysteines resulted in complete loss of APN surface expression and activity.
  • Inactive cysteine mutants were retained in the endoplasmic reticulum, indicating impaired folding or trafficking.

Conclusions:

  • Extracellular cysteines are essential for the proper expression and function of APN at the cell surface.
  • Thiol-dependent modulation of APN activity represents a novel regulatory mechanism for surface-bound peptidases.
  • These findings have implications for understanding diseases involving inflammation and malignant transformation.